This week, the Wisconsin Supreme Court upheld the use of a covert GPS tracker installed by police in the vehicle of a man suspected of burglaries in 2007. Using the GPS tracker installed on the vehicle police were able to place and apprehend the suspect at the scene of a burglary where additional evidence was found.
The tracking device was installed after a warrant was obtained, however the suspect’s defense included that the use of the GPS tracker exceeded the scope of the warrant due to its real time tracking capabilities. In a majority ruling the court found that the use of the GPS tracker by police was covered by the warrant.
Source: http://gazettextra.com/news/2013/feb/07/high-court-oks-cops-gps-use-burglary-case/